<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        .con{
            width: 100px;
            height: 100px;
            background-color: gold;
            margin: 50px auto 0;
            position: relative;
            border-radius: 14px;
        }
        .box{
            width: 28px;
            height: 28px;
            background-color: red;
            color: #ffffff;
            text-align: center;
            line-height: 28px;
            position:absolute;
            left: 86px;
             bottom:86px ;
            border-radius: 14px;
        }

    </style>
</head>
<body>
    <div class="con">
        <div class="box">5</div>
    </div>


</body>
</html>